Enum futures::task::Poll 1.36.0[−][src]
#[must_use = "this `Poll` may be a `Pending` variant, which should be handled"] pub enum Poll<T> { Ready(T), Pending, }
Indicates whether a value is available or if the current task has been scheduled to receive a wakeup instead.
Variants
Represents that a value is immediately ready.
Represents that a value is not ready yet.
When a function returns Pending
, the function must also
ensure that the current task is scheduled to be awoken when
progress can be made.
Implementations
impl<T> Poll<T>
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pub fn map<U, F>(self, f: F) -> Poll<U> where
F: FnOnce(T) -> U,
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F: FnOnce(T) -> U,
Changes the ready value of this Poll
with the closure provided.
pub const fn is_ready(&self) -> bool
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Returns true
if this is Poll::Ready
pub const fn is_pending(&self) -> bool
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Returns true
if this is Poll::Pending
impl<T, E> Poll<Result<T, E>>
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pub fn map_ok<U, F>(self, f: F) -> Poll<Result<U, E>> where
F: FnOnce(T) -> U,
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F: FnOnce(T) -> U,
Changes the success value of this Poll
with the closure provided.
pub fn map_err<U, F>(self, f: F) -> Poll<Result<T, U>> where
F: FnOnce(E) -> U,
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F: FnOnce(E) -> U,
Changes the error value of this Poll
with the closure provided.
impl<T, E> Poll<Option<Result<T, E>>>
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pub fn map_ok<U, F>(self, f: F) -> Poll<Option<Result<U, E>>> where
F: FnOnce(T) -> U,
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F: FnOnce(T) -> U,
Changes the success value of this Poll
with the closure provided.
pub fn map_err<U, F>(self, f: F) -> Poll<Option<Result<T, U>>> where
F: FnOnce(E) -> U,
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F: FnOnce(E) -> U,
Changes the error value of this Poll
with the closure provided.
Trait Implementations
impl<T> Clone for Poll<T> where
T: Clone,
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T: Clone,
impl<T> Copy for Poll<T> where
T: Copy,
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T: Copy,
impl<T> Debug for Poll<T> where
T: Debug,
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T: Debug,
impl<T> Eq for Poll<T> where
T: Eq,
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T: Eq,
impl<T> From<T> for Poll<T>
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impl<T> Hash for Poll<T> where
T: Hash,
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T: Hash,
impl<T> Ord for Poll<T> where
T: Ord,
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T: Ord,
impl<T> PartialEq<Poll<T>> for Poll<T> where
T: PartialEq<T>,
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T: PartialEq<T>,
impl<T> PartialOrd<Poll<T>> for Poll<T> where
T: PartialOrd<T>,
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T: PartialOrd<T>,
impl<T> StructuralEq for Poll<T>
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impl<T> StructuralPartialEq for Poll<T>
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impl<T, E> Try for Poll<Option<Result<T, E>>>
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impl<T, E> Try for Poll<Result<T, E>>
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Auto Trait Implementations
impl<T> RefUnwindSafe for Poll<T> where
T: RefUnwindSafe,
T: RefUnwindSafe,
impl<T> Send for Poll<T> where
T: Send,
T: Send,
impl<T> Sync for Poll<T> where
T: Sync,
T: Sync,
impl<T> Unpin for Poll<T> where
T: Unpin,
T: Unpin,
impl<T> UnwindSafe for Poll<T> where
T: UnwindSafe,
T: UnwindSafe,
Blanket Implementations
impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> From<!> for T
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impl<T> From<T> for T
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,